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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1be22dc70f3a63cd51e3c186dbcffb05d220cd6e32b12cabe6a86ac1c036e548' 
  AND token = 'hnZdDbwARqDgRp3rdI8AO4nuGu039aDwyp9cMcok0l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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