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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f2cb7f1d3efddeed8c37895e141dbccf9560cae0d8f282407b0fc9003911976' 
  AND token = 'GCY1vgdZNLnagtt896WeDmJ8/RfBUOECgwskx/Tpues=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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