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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '206e65c34d9f4a452c6064e31d5a8929d99cdfb2bdb5647029c29a21f3b26a86' 
  AND token = 'p02GKEQ4/P/B+yjMH8vG0a4uv+8KzoJIiAn9yfOAztQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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