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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9115c6464cf2ae1b5872b38a36164f790b891b71e493b3ee8f1a0eb96eff2a78' 
  AND token = 'Cfo5l4r3JbTkxkFf52NLVMqQBK2EndIl9i6xmcaJYpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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