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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bdfdb35e8ac31017db2ecf9d9e9cdacb2f5af07fb76cb380bbef54b3d30ad62' 
  AND token = '37XewZH+mT8eMKQTVKidw8nsNTdW9FG5++22vPt1a8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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