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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fdbdec681774daf69095e6c235ba90b0f30852dcce495bc451a77c15c8844f4' 
  AND token = 'Mnq4S7ku1jxZojiNJUTSKHNgUDKz+f2JMdnsW5ptfFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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