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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f296c2a4f285924abda2355c58cb8ddafc37fb345cbfdaa18c8442cf56c9dcfc' 
  AND token = 'SXBcu8Ja/EXP481xxSts2chkOVzs3M+s4By4brtrHIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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