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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09bc4f6ceccee9e0828311a436693191141b413c92a1ea2701dbff15ad285275' 
  AND token = 'HjT0NEP6izEQIe6iaV9Za7cr94e//L/trv4gEm93Z5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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