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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc5c92a062c55d1ac9b782496ac677907f908ff3030d17a7e85b63ccf8c17563' 
  AND token = '/RevnG8Gvcr6XugfH4OgP2xVkQr9Ac8QYmxHQ8modlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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