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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c78b70efe699cb8350a4950ffbac158affc03de63747ebe72b4f5588b551eb85' 
  AND token = 'SiO3XThOy+DZIr6kqqxRC2IvmnOCb520wYtlV+Sll+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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