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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7911e92f83f556a9f10aba0bb3b4a57688382b4f328d0ed8470cdd8fb14f1d98' 
  AND token = '9irKdCJitndHK3CYc0LEOwcaVV1EGr71LYazagbmRDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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