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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4cf4a16b1100688142282e9da0bd9b4f7b7c8ac92f6f6f96c2b28c48cf4cca1' 
  AND token = '5TJjCwOuyJYu462qTVGuUEOvMgEeZCK1F5d5UrnlRcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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