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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb5cc48f0d22edffe52984bb4272bb437119efc60c7061bf3fe0d7cccda8d293' 
  AND token = 'G1d/93Ai/Y4AGKApCFeLMj9aNAaMDPHqGfVm7nAaYpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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