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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '993ee64e27529449fb0c94f79b0c239c3a1d81c48dab0abb302edd3a27f30029' 
  AND token = 'efg67g3VRNdNpGIFR57Pif4iTTWioPf8NLNcgYx+k44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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