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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36622e2a5b8e2b58b8bc92a1b5e8556d6a050b9adb09f4f56740a3ea55e7340a' 
  AND token = '0PqYmvE+ypNHRzLehsqHDuFtJCeBKm3c9bnIsZg7oDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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