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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '661957aba100bcc4df480c1311260dd1b1bf7f3f20e9a196605accc5796dc3e9' 
  AND token = '9hWezZQHJf+0tvc0yDOY0OCX06773q9VI4FZhdvJYmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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