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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d56bbd5a7168209b11fe95bb05c9bd11c4d4f87a19c1252e243d1910eb654e' 
  AND token = 'j2glf4xS6vG/O5phXug3EeYqsE4F21Oq4lLu7Icwgj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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