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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '548e80fba00e16a8e8afcc35103fa80779e620064f9619f5d453fbef9f020600' 
  AND token = 'ZcczrMWFOHY3ikKbSWatwz+2GGqmT2CWVOVX7SbL1gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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