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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b03bdb50d8d1a56b0f2743c342e048a21f46f68460c7b0c1a7cb6b15a68f3b32' 
  AND token = 'liO7A4CMtAXsCpIUkYwAHQIvMNGhL7VNUfyGzHCtZ08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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