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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59b93808ca535f52c1d76717090b57dd9f9c85d6097539434683b796fb328be4' 
  AND token = 'IGQYnPfGgQ7WB5mEK3c8Upf3W4RaX99mWTYgrsdIVxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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