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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0da0d5e470832e97703da8539fb82a110ba8286d4eb386dfb57962d06f6bada' 
  AND token = 'MhNpsyBgU9/4iA2vV4lFhMgEigkzapzi8EfGIdyg1CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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