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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a20426af0ecba2d9ed488bbbc2e0c4c3ab96904bc96d39c2efddaad65d33eee' 
  AND token = 'KSt2CKlK5Laz3C0FJ5claPsuop1z7lMEuV6A2IcjqO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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