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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f1df3abaad8d82b076f11a32314f389466ce1fadf46667dc11747e63723fed5' 
  AND token = 'A15Ci2LRRS5V0GgQkC7BAgRRjuxJ/Mj2aGdmDYrugMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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