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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b079c905a523274e4f5bc572e0f42ee83270592270a1e4eecb37440990d4960' 
  AND token = 'eLsrwkOn6P0B72zqMNaWSs1Tk1aUHdvV5QpKL4n95ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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