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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14e04176c4a1c4dab1687b14e714e587479de0eec2377cf176da37670aa7c3f2' 
  AND token = 'xvsOXLaNetzerVGB/Hkw90ReTSqygg/bUN28HvRas5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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