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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca0829c4a0bf7d4fa4bbe589f0f38efdf3a32a268b7e9eed8b0f4911c08addf3' 
  AND token = 'F0Naf6qBhvkIJJ9v8nihI9xYce0l1mplJK/be7kBqrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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