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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5156d7c46093eef9518f0509dfef76a71e120d2cee58b5f868b2d9be9ca9b3a6' 
  AND token = 'REeyv6Hg1vwwoC1HAiYl7e2K6ScCC6rtmhqs0dAYIXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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