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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce7050f2be693febbe8877cb561caf88b1f70ab03813ace1c35ffee619fe4fa4' 
  AND token = '7ewUO0PeQHWc3Zf1ercxvyd+sAQNDYjA4AJSCta/qqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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