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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e44c9e9b1ccd10d168a9ff6e20d5d850dae7a8d543b7787b376fdab7d5f9f4a' 
  AND token = 'GwtLOc7LzpNNv9N6JjslXpdODe1wHXU0ScXMiZEtIPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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