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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01debfdebb5b4630ad5b92393af8cd0e46104ab6a6a48ed8248dc62b7f22174f' 
  AND token = 'midN0wUscYms2vNK4Th71jscU5lthJTFkNBMECcsHwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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