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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b406f1996435dfe8cc4b56282eb4f276e24ba6f85b2e6a1396c1923ff14f1812' 
  AND token = 'w6ySyueU4Hbi3ndL+hWy//AFapokzHRVLAam1sJQbgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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