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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b7eb8ebcfd410992e8eb4096f837de7513ea1c337623e8a98977f80b7892540' 
  AND token = 'JdMH/X+l/tzgTnpBMeJWK0IV/bIHgrFWXNUqJcDA6mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}