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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13db89c9a9b1d019153adca7d8e51401a8842d6cbd44de974b3ea4152b30c59e' 
  AND token = 'OHtV3xsdvGlmSICv4LpSFIJxlFWifqN3bI6LmyqzHLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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