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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15a4cb5fa90f45d68b3face67786e43317dbbd0e277cf96431ddf54cdbb96cf7' 
  AND token = 'z9p5dVQfLJ95VOMfCOQq+WW5cf8t4YX9C8HCJ8qJdf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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