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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23b76c1d93135ac961c736e11c94f3e585038db0d0dcc825fa46880ad202421' 
  AND token = 'h7gacs7+OrNebv61GEZ1KS7IBJp/o7kLwBfxqbfet3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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