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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8068e0700ef2b8eee38e76b3fade3b59a7b437a082e36518cabab1aad7a863b9' 
  AND token = '9NBjD/zpL96ahc6lj4/E6kTRJO2wxft5V9+U5M5lwZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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