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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd259c22cd5ff1650fecd909e51891b6c85d33d29e14de45ece7abd429f62fe96' 
  AND token = 'kAbIpNonRKywsW7slvW8fOm3eeo/qV2FG1g+dZltR1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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