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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ee46296092b3c9d064cd0b75c297360bcf89fd450f373a1ec37e771f7f1e18' 
  AND token = 'C8tRxPhBmSPec1EsHRoRpgp+noOYwU8e8yFVQLSe1PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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