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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f328371223db17ff1569fd9cfd7c5b41e016b4e3873477232e521c641d01cc' 
  AND token = 'p5r6L4zIP3CIFYiLFOkPsroqHDmB2Ke394GX9Tht0Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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