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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ee1ee9977798e08586d51c802cd2493cf4bffec388fbb94c6d01dbd32b33b3' 
  AND token = 'D5SfR55YJMTJkVQFp/m8vIYK1QMhLt+FaCxO2CukNvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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