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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18ccdb4817e5665df1dbb289a7bed5ec0a668b5c9b61d3c6000eae0f1b36f8a2' 
  AND token = 'i8e9FiRlTO2AFmEhyyKXn70pV8al/V/dVUGZirvRpZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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