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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8af79ba6e802fee9413f24afc3779a33b0d977d94b923a3aada7e5a093e5d27' 
  AND token = 'ozrPWjaJXJOnx4LELPHg/wustKBKLgLcZt1pPLExOMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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