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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6603e09c98b174d2afd8d90add7335a8923a832937936d36ac75ca58b9e75f41' 
  AND token = 'L0/rCJ94O4Sy/2thujUlJMc3lD4FVseawS3os3rMXBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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