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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe84ae0e8d6211241889d6240a789a97e32c22f71db0b25976e333beb99a11d' 
  AND token = 'V1YgmvhNxKs892C5qM7gG/6bJl+P8496DOBtUinLddA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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