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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f76bc1badbde4c366de6a35f0ec477a47c9ad1209c859165229d7c8013b4580' 
  AND token = 'VPzU9tkkOWJ8cTuns1WSvegTPA9BxSW3AspNdK9YLPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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