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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '974ec80738b3a5d1d74117da3127b6a25af2db0381a908d0eeef4871b3dd4ee5' 
  AND token = 'XuiGS3dfw/Sr9w9wYPeFwmZNaamHoBxDeQpqADzmGAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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