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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0976220abd012098ea11481bfc1fc10e64876f2d22b6d43a6c79acb84ef2e28a' 
  AND token = 'V4k7ExYiioi/KTW7OFqYjgVIDuHQYNFN3TACr9sxViU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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