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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a20997d72ddb04966a1d0e46e649451df317814b19d09f8f9072985ef6f9176c' 
  AND token = '+b4n9r7DjftD+Fy/+bh+w8PLruastDn4Yl1wnkOyPYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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