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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd62db731c496f29ed7cfaac2e56ed0e20e771f22306cfab7020d1311cde25f9' 
  AND token = '99ffNf8RtypQE6rYNREBRyQgGOEsj8rdmTo5f8knpb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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