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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab0e7dee7ae6d632a1b303d69b90ee6f3c7a24305d368fb7d5fdbc047831ed01' 
  AND token = '8d3OcdYm3chpwePugLs8BwIJywt6O7c45rvQ7quygrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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