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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab69a45457e3b28b9cc499b7c1301c2d24bfc7115369c018a5b587e6b6b3b0e' 
  AND token = '6CtqaukIew8npat+gHh8TzDa81GHTvDpJyQi6+NlaF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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