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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '985fe20c29252fe35fd92ae5a7af6fb022c34ef6e5a4d4fb370a4ca58978926e' 
  AND token = 'lunvAXSxezsd4S8MqQsAGf6uPV7Aq5i24xs3lvO/h0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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